Concrete pipe



June 30, 1964 M. R. MILLER CONCRETE PIPE Filed Sept. 19, 1960 it FL IN VEN TOR.

BY MARION R.MILLER.

A7TORIVEY United States Patent "cc 3,139,469 CONCRETE P1913 Marion R. Miller, 914 W. Oakdale, Fort Wayne, Ind. Filed Sept. 19, 1960, Ser. No. 56,821 1 Claim. (Cl. 264262) This invention relates to concrete pipe and is more particularly concerned with the construction of machinemacle concrete pipe whereby a premium joint is obtained by placing plastic permanent inserts in the bell portion of the pipe and on the spigot.

Numerous gaskets and other means for bell and spigot concrete pipe have been proposed in the prior art, many of which are expensive to manufacture or require laborious means in placing the joints together. In several instances in laying concrete pipe, such as laterals in housing projects or when the pipe line passes underneath a stream or river, it is necessary to have a premium joint.

It is a principal object of the present invention to provide an improved concrete pipe having permanent plastic inserts on the bell and spigot which will provide a premium joint.

It is another object of the invention to provide new and novel means for manufacturing concrete pipe wherein the plastic insert is positioned on the pallets so that they are permanently retained by the bell and spigot.

It is a further object of the invention to provide a plastic insert having end members to provide water stops and means to permanently secure the insert to the bell and spigot.

Other objects and features of the invention will become apparent from the following description which proceeds with reference to the accompanying drawing wherein:

The single figure is a fragmentary sectional view of a concrete pipe and the corresponding mold.

Referring to the drawing, the reference numeral 11 desi nates a plastic bell insert having one end 13 turned inwardly to provide a water or liquid stop 13. The other end 15 is turned outwardly to provide another water stop. A projection 17 is disposed intermediate the ends and serves as a stop or means to permanently secure the insert in the bell 19.

The spigot plastic insert 21 has one end 23 turned inwardly to provide a liquid or water stop. The other end 25 is turned outwardly to provide another water stop. A depression or recess 27 is formed intermediate the ends and serves to receive a rubber gasket 31. The projection 27 also serves as a means for permanently securing the plastic insert to the spigot 33.

Considering now the manufacturing of the concrete pipe, the plastic bell insert 11 is placed on the bell or bottom pallet 35 and the outside pipe forming jacket 37 3,139,469 Patented June 30, 1964 is secured around the bell pallet so that the bell pallet will rest on the support 39. The rubber gasket 31 is then positioned in the recess 29 and placed on the top or spigot pallet 41 and positioned thereon so that the rubber gasket corresponds to or is received in the recess 43 formed in the pallet. The spigot pallet is then secured to the outside pipe forming jacket 37 by a dowel pin 45. The no-slump concrete mix is then disposed within the forming jacket by a conventional packerhead method or may be packed by other conventional means, such as tamping, vibration or spinning. It can be readily seen that the projections 27 and 17 will form a recess in the spigot and bell respectively so that they are permanently attached to the concrete pipe.

It will be obvious to those skilled in the art that various other changes and modifications may be made in the embodiments of the invention described and illustrated without departing from the scope of the invention as defined in the appended claim and it is intended, therefore, that all matter contained in the foregoing description and in the drawings shall be interpreted as illustrative and not in a limiting sense.

I claim:

A method for forming machine-made concrete pipe with permanent sealing inserts to provide a premium joint comprising: placing a plastic bell sealing insert on a bell pallet, securing an outside pipe forming jacket around the bell pallet so that the bell pallet is supported thereon, placing a rubber gasket in a groove on a plastic spigot sealing insert, positioning said spigot insert on a spigot pallet so that the gasket is received in a recess on the spigot pallet, positioning and securing the spigot to the outside pipe forming jacket and filling the pipe forming jacket with a no-slump concrete mix.

References Cited in the file of this patent UNITED STATES PATENTS 2,178,015 Brunetti Oct. 31, 1939 2,216,896 Trickey Oct. 8, 1940 2,224,419 Whitman Dec. 10, 1940 2,729,873 Ludwig Jan. 10, 1946 2,566,689 Whiting Sept. 4, 1951 2,770,476 Clevely Nov. 13, 1956 2,798,373 Harza July 9, 1957 2,865,267 Bailey Dec. 23, 1958 2,901,904 Wey Sept. 1, 1959 2,937,065 Harza May 17, 1960 2,955,322 Hite Oct. 11, 1960 2,958,906 Youthed Nov. 8, 1960 2,983,081 Brown May 9, 1961 2,992,457 Harrison July 18, 1961 3,039,232 Dunn June 19, 1962 

